Fix typo in availability schema property name

[fpolisupsi]

Typo in the schema property, in the final output.
cli output sample:
{
"id": "[cut]",
"isAvailiable": true,
"name": "[cut]",
"type": "Microsoft.NotificationHubs/namespaces/checkNamespaceAvailability"
}

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[azure-client-tools-bot-prd]

Validation for Breaking Change Starting...

Thanks for your contribution!

[azure-client-tools-bot-prd]

Hi @fpolisupsi,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

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[Copilot]

Pull Request Overview

This PR fixes a spelling error in the availability schema property name, correcting "isAvailiable" to "isAvailable" in both the Python property name and its serialized JSON representation.

Key Changes

• Corrected misspelled property name from is_availiable to is_available
• Updated corresponding serialized name from "isAvailiable" to "isAvailable"

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[github-actions]

Hi @fpolisupsi

Release Suggestions

Module: notification-hub

• Please log updates into to src/notification-hub/HISTORY.rst
• Update VERSION to 2.0.0b2 in src/notification-hub/setup.py

Notes

• For more info about extension versioning, please refer to Extension version schema